Cominy For A fish Day

This is an excerpt from Le Menagier de Paris(France, 1393 - Janet Hinson, trans.)
The original source can be found at
David Friedman's website

Cominy for a Fish Day, Fry your fish, then skin almonds and grind, and mix liquid or fish stock and make almond milk, but cow's milk is more appetizing although they say it is not as healthy for sick people; and with the surplus do as above.

Item, on a meat day, if you cannot find cow's milk, you can use almond milk, and do with the meat as above.